VETERINARY MEDICINE. 477 



and nymph of the brown tick; details of adjustment of the 3-day dip; letlial 

 effects of 3-day and laboratory dips on distended female brown ticks ; the effect 

 of 3-day dip at intervals of 72 hours ujwn adult tick life generally ; the lethal effect 

 of dips ii and ^ strengths) at intervals of 48 hours, showing the increase of 

 efficiency resulting from the addition of soap and paraffin ; details for prepara- 

 tion of 3-day dipping fluid; details for preparation of 3-day ear dressing; tick 

 migration experiment ; relative tick activity during day and night ; residual 

 effect of 3-day dip in horses and cattle; the agency of the tail tuft in the col- 

 lection of ticks; the suitability of 3-day dip in the treatment of scab in sheep; 

 effect of weekly dipping process with laboratory dip upon secretion of milk ; 

 and a description of the isometer devised by the author for use in the estimation 

 of the exact percentages of arsenic present in different samples of dipping fluid. 



On the blood parasites found in animals in the zoological gardens during 

 the four years 1908-1911, II. G. Plimmer (Proc. Zool. Soc. London, 1912, II, 

 pp. 4O6-J1I9, pis. 7). — During a period of 4 years the author examined the blood 

 of every mammal, bird, reptile, and batrachian, which died in the zoological 

 gardens, a total of 6,430 individuals. Blood parasites were found in 447, or 

 about 7 per cent; these animals representing 256 species. The results are 

 reported in detail. 



Amebae as the cause of disease in domestic animals, E. Lehmann (Centbl, 

 Bald, [etc.], 1. AM., Orig., 62 {1912), No. 7, pp. 5.S9~60o, figs. l',).—A brief re- 

 view first presented is followed by a report of studies of amebic dysentery in 

 the horse, amebse in the walls of the fore-stomachs of bovines, and amebse col- 

 onies in the intestines of sheep. A bibliography of 61 titles is api)ended. 



A contribution to the pathogenesis of B. abortus. Bang, II, M. Fabyan 

 (Jour. Med. Research, 26 (1912), No. 3, pp. J,Jtl-J,87, pis. 7).— In the first part 

 of this paper (E. S. R., 26, p. 586) the author presents a historical review of 

 investigations of the etiology of contagious abortion. A report of investiga- 

 tions of the disease produced by inoculating guinea pigs follows. 



" Badllus ahortus may be said to cause lesions in guinea pigs of a practically 

 constant and most remarkable character. These usually appear between the third 

 and sixth week (within 10 days as determined in sections by the microscope), 

 the acute changes extending over a period of 10 to 20 weeks, after which repara- 

 tive processes appear. The disease is accompanied by fever and tends toward 

 final recovery, though the animal may die from rupture of the spleen, emacia- 

 tion, and exhaustion. 



"All the tissues of the body may be attacked with the exception of the 

 muscles. This universality and frequency is best seen in sections under the 

 microscope, as only the far advanced lesions are recognized by the unaided eye. 

 In the tissues involved and in the histological changes produced, the disease 

 closely resembles tuberculosis. The lesions have a predilection for the peri- 

 vascular and subcapsular regions of the various organs. Injections cause at 

 first a profound disturbance of the circulation in certain organs, notably the 

 spleen, which becomes enormously engorged. Intra-abdominal inoculations are 

 frequently followed by adhesions about the spleen. The localization of the dis- 

 ease in the testicle as well as in other organs, even when B. abortus is inocu- 

 lated subcutaneously, is quite remarkable. The proliferation of bone although 

 not common is extraordinary when present." 



Inoculations led the author to conclude that it is highly probable that B. 

 abortus produces lesions in mice. 



The cultivation of B. abortus is described at length: "The cultural charac- 

 teristics of this organism are quite constant when once its ability to grow on 

 artificial media has been established. Among these characteristics may be 



