Nicoll and Minchin gave an account in 1910, in the Abstract of Proceedings of the Zoological Society of London, of their finding a Cysticercoid in the rat-flea, Ceratophyllus fasciatus, “very like the scolex of Hymenolepis murina Duj. … it [H. murina] was the only rat-tapeworm to which the Cysticercoid could be referred.”

In December, 1922, Sir John Russell called the writer's attention to some diseased potatoes which had been sent to the Rothamsted Experimental Station. Dr. W. B. Brierley, Head of the Mycology Laboratory, had examined them and had failed to find evidence of fungal attack though the diseased areas bore a superficial resemblance to the appearances presented by “blight” affected potatoes due to Phytophthora infestans. He had, however, found numerous eelworms in the diseased tissues and because of this the writer was asked to examine the material.

The biology of the infective larva of the Sheep Hook-worm Monodontus trigonocephalus would be expected on general grounds to resemble that of Ancylostoma duodenale, to which it is closely related. Two facts in the biology of the adults must, however, be borne in mind. In the first place, the normal temperature of man is about 37° C, while the normal temperature of the sheep is 39°–40° C. Secondly, both Looss (for A. duodenale) and Hesse (for M. trigonocephalus) have shown that the pre-infective larvæ feed actively on faecal matter. Looss has drawn attention to the fact that cultures of Ancylostomes made from the fæces of a host living on an exclusively herbivorous diet, were very much poorer in the resultant crop of larvae than those made from fæces of a host living on a partly carnivorous diet. Now the adult Monodontus lives in a host which is purely herbivorous, and the larvæ are reared in fæces entirely of a vegetable nature. One might therefore expect differences in the biology of the ensheathed stage.

The Filariasis Commission, composed as it was of British, Chinese, and Mohammedan members, was able to take a more extensive and a more representative survey of the incidence of filariasis than would have been possible in the case of a single investigator. Dr. Khalil had frequent invitations to local Mohammedan ceremonies, and as these were usually held at night, he was able to examine a large number of bloodfilms from East Indian immigrants. Dr. C. U. Lee was very hospitably received by the Chinese families of Georgetown, and collected statistics as to the filarial rate amongst them on a scale that was hitherto unattainable. The whole commission, working together, was able to undertake a survey of an institution such as Georgetown Prison, the Almshouse, or Christchurch Public School with little inconvenience to the children or inmates. Thus from hospitals, schools, prisons, asylums, and domiciliary visitations, the Commission collected details and examined blood-films from 4,215 inhabitants of British Guiana. The total number of examinations was made up as follows:—

During the month of July, 1921, I had the opportunity of working with Dr. Annandale on the molluscs of Loch Lubnaig and Loch Vennachar in Perthshire, Scotland; and I was able to study carefully the two cercariæ infecting Limnæa peregra Müll. The material was examined in the living condition. Some of it was fixed in sublimate acetic and preserved in alcohol for subsequent study in sections.

Page 89, Legend to Fig. 13, add “ B and C after Molin.”

Page 126, line 16 from bottom, for “.01 ” read “. 1. ”

Page 134, line 11 from top, for “ Fig. 1 ” read “ Fig. 2.”

Page 144, line 3 from top, for “ Endoparasitic in stem tissue of ” read “ Ectoparasitic on,”

Page 147, line 9 from top, delete the words “ enters the stem tissues and.”

Page 168, line 2 from bottom, for “.66 ” read “.46.”