xxxviii SCIENCE PROGRESS. 



of coloured drawings of the more frequently seen affections. Dr. 

 Cory's reasoning on the vexed question of how far these eruptions are 

 directly due to vaccination is close and accurate. Moreover his obser- 

 vations are marked by sound common-sense and knowledge of his 

 subject, and we cannot do better than recommend all who seek infor- 

 mation on this point to refer to his work. 



The practical details of vaccination occupy Lecture V. It goes 

 without saying that the experience of a man like the author, who has 

 had such ample opportunities of observation and such wide acquaint- 

 ance with the practical work of vaccination, who, moreover, is such 

 a past-master in all essential details that his success for the 

 past twenty-two years has averaged 96-18 per cent, is invaluable, and 

 specially interesting is it to have the results of his experience of the 

 much-discussed question of insusceptibility. Among 16,000 first 

 attempts of vaccination with humanised lymph Dr. Cory has had 

 fourteen failures, being at the rate of one failure in 1140 children 

 operated upon. 



Amongst 21,781 children vaccinated on the arm with calf lymph 

 he has experienced seventy failures at a first attempt, being at the rate 

 of one failure in 311 children operated on. From the above figures 

 and certain calculations, which it is unnecessary to enter into here, it 

 has been determined that one case of statutory insusceptibility as 

 evidenced by failure to obtain any vaccine vesicle in a given child after 

 three several attempts at vaccination, may be looked for in every 

 6,684,495 cases when working with calf lymph, whilst with humanised 

 lymph the figures stand at one in 329,232,000, so that there is not any 

 great probability of numerous cases of insusceptibility occurring in the 

 practice of a country vaccination ! 



The statistics given as to the keeping qualities of calf and human 

 lymph on points and in tubes are of utility, and of especial importance 

 are the author's observations and clever illustrations of the relative 

 effects of vaccinating in few or many places. 



We fancy there is a plate missing somewhere, as we have failed 

 to discover the promised figure of the vaccinated calf, method of ap- 

 plying forceps, etc. The chapter concludes with a tabulated statement 

 of the symptoms observed in a case of vaccination from the first to the 

 twenty-first day, and some observations on secondary vaccinations. 



The last Lecture is devoted to a discussion of the relations of cow- 

 pox, horse-pox, and camel-pox to small-pox, and Dr. Cory comes to the 

 conclusion that vaccinia is but a modified form of small-pox, and that 

 small-pox is the origin of cow-pox, horse-pox and camel-pox. 



Throughout the 122 pages of which the work consists the author's 

 statements and conclusions are characterised by an evidence of wide 

 experience, keen insight and sound common-sense, and our only regret 

 is that with such extensive knowledge and practical experience Dr. 

 Cory has been content to publish so small a volume. We hope that in 

 a second edition he may see fit to enlarge it considerably. 



