2 OYSTERS AND DISEASE. 



colleague Professor Sherrington, also a member of the Committee. Our friend Dr. P. 

 P. C. Hoek, Scientific Fisheries Adviser to the Dutch Government, visited our labor- 

 atories in February, 1897, for the purpose of seeing our work and its bearings upon 

 Dutch Oyster culture. He went through all our results with us, and took part in an 

 examination at that time of various kinds of green oysters. We have recently (June, 

 1898) had the opportunity of discussing fully the histo-chemical reactions with Professor 

 Macallum, of Toronto, whose opinion on some points will be referred to further on. 



We desire to acknowledge, finally, the help we have received, in what has been 

 a very laborious investigation, because of the large numbers of animals dealt with and 

 the very different lines of work involved, from the Assistants in our laboratories. We 

 would thank especially Mr. Andrew Scott and Mr. James Johnstone, " Fisheries " 

 Assistants in the Zoological Laboratory ; and Dr. Dutton, Dr. Christophers, and Dr. 

 Abram, in the Pathological Department. Some of the figures in our plates have been 

 drawn, under our direction, by Mr. Johnstone, and others by Mr. Fisher of the Patho- 

 logical Department. The rest are our own. 



LiVKRPOOL, 



December, 1898. 



