584 EXPERIMENT STATION RECORD. [Vol.37 



The successful treatment of the disease with a vaccine made from the Preisz- 

 Nocard bacillus is noted. 



The vaccine was prepared by heating a suspension of the organism in physio- 

 logical salt solution for 24 hours at 37° C, separating the organisms by cen- 

 trifugalization, treating with alcohol-ether mixture, and finally drying over 

 sulphuric acid. It produced no general reaction, the thermic reaction being 

 only from 0.5 to 1° and the appetite and general condition remaining normal. 

 The number of injections found necessary varied with the degree and duration 

 of the disease, two or three generally being sufficient. The value of local treat- 

 ment with tincture of iodin and other antiseptics is noted. 



Salvarsan in the treatment of canine distemper, C. Kbocheb {Abs. in Jour. 

 Amer. Vet. Med. Assoc, 51 (1911), \o. .}, pp. 565, 566). — It appears that sal- 

 varsan does not exert either a curative or an otherwise favorable action on the 

 course of canine distemper. 



On the occurrence of a pseudoparasitic mite (Cheletiella parasitivorax) on 

 the domestic cat, S. Hibst (Ann. and Mag. Nat. Hist., 8. ser., 20 (1911), No. 

 115, pp. 132, 133, fig. 1). — This records the finding, on post-mortem examination 

 of a cat affected with mange, of numerous specimens of C. paraMtivorax on 

 various parts of the body and a few isolated eggs, each fixed to a hair. Pre- 

 sumably this mite fed on the acarid Notccdrus cati. 



Chicken pox in poultry. — Preventive suggestions based on practical experi- 

 ments, H. E. Upton (Brit. Columbia Dept. Agr., Circ. Bui. 20 (1911), pp. 5, 

 figs. 5). — The author has vaccinated approximately 3.000 birds ranging from 5 

 weeks to 3 years in age without observing any bad effects aside from 3 deaths, 

 due mainly to emaciation before vaccination. Control birds were left in each 

 flock, and 40 per cent died. Egg production was not affected by vaccination in 

 any way other than the handling of the birds would cause. 



" Some flocks were vaccinated with vaccine made from scabs only. Otliers 

 were vaccinated from vaccine made from scabs and cheesy exudate. Some 

 were vaccinated with vaccine made up of scabs and exudate mixed together 

 before attenuated. Others were vaccinated with vaccine made by attenuating 

 scabs and exudate separately and mixing the two vaccines together i)efore in- 

 jection. The best results were obtained amongst the 7 flocks by the use of the 

 vaccine made up of the scabs and exudate ground together before being attenu- 

 ated. 



"Data were not obtainable from any source relating to the vaccination of 

 young chicks. Our experiments show that good results are obtainable by 

 vaccinating 5- to 8-week-old chicks (majority showing signs of disease after 

 severe chilling) twice with 0.5 cc. of vaccine at intervals of 3 to 4 days. Two 

 cc. was injected in 3 or 4 very bad cases expected to die in a few hours. 

 Cases recovered and can not be noticed other than by band number in flocks 

 after expiration of 7 months. 



" Strong tincture of iodin is recommended as the best disinfectant for use 

 with this disease. The scabs and exudate should be removed with a sterile 

 pair of forceps and tincture of iodin applied to the exposed surface." 



RURAL ENGINEERING. 



A textbook of practical hydraulics, J. Park (Philadelphia: J. B. Lippincott 

 Co., 1916, pp. XVI-\-28Jt, pis- -47. fiffs. 115).— This is a handbook for the practical 

 use of irrigation, hydraulic, and power development engineers. It comprises 

 chapters on some first principles : definition of terms ; flow of water through 

 orifices ; friction in pipes and channels ; the discharge of pipes ; flow of water 



