156 Scientific Intelligence. 



flies, jiggers, ticks, aphides, plant bugs, and locusts are some of 

 the other insects which affect the human interests of the region. 



Dr. Balfour describes and figures a blood parasite of the rat 

 and Jerboa rat, with its probable life cycle in the flea. The 

 prevalence and distribution in the Sudan of the trypanosome dis- 

 ease of cattle and mules are discussed and a large amount of 

 experimental work described. Various animal, human, and vege- 

 table pests are described by F. V. Theobald, who also presents a 

 second report on the mosquitoes, describing new genera, species 

 and localities. The report of the traveling pathologist and natur- 

 alist, Dr. Sheffield Neave, contains an account of blood examina- 

 tions and pathological conditions observed in regions difficult of 

 access. 



The final paper of the report, by Dr. William Bean, gives 

 analyses of certain articles of food and commerce of the region^ 

 and describes the chemical nature of certain products used or 

 manufactured by the natives. 



That so high a class of work can be prosecuted in spite of the 

 heat and dust and other unfavorable conditions of the region is a 

 striking proof of the persistent energy of the laboratory staff. 



W. E. C. 



4. Animal Micrology ; Practical Exercises in Microscopical 

 Methods ; by Michael F. Guyeb, Ph.D. Pp. ix + 240. Chicago, 

 1906 (University of Chicago Press). — This little book contains 

 practical directions for the preparation of material for micro- 

 scopical study. The methods usually employed in making his- 

 tological preparations are described, with important suggestions 

 as to the selection of particular reagents for certain special tissues. 

 The technique of decalcification, maceration, injection, and the 

 mounting of objects of general interest, is followed by an 

 account of special embryological methods. The optical proper- 

 ties of the microscope and the preparation of standard reagents 

 are described in appendices, which also supply many suggestive 

 hints for obtaining microscopic material for zoological courses. 



This will undoubtedly prove to be a most convenient addition 

 to the few really helpful handbooks for the zoologist or embryolo- 

 gist, and should be accessible for every student in the laboratory 

 where the microscope is used in the study of biology. 



W. E. C. 



TV. Miscellaneous Scientific Intelligence. 



1. Carnegie Institution of Washington, Year Hook JVb. 5> 

 1906. Pp. 266, with 13 plates. Washington, 1907.— The Year 

 Book of the Carnegie Institution is always of much interest, 

 since the work that the institution is doing is so important, and 

 at the same time yet so novel, that many new problems are pre- 

 sented for consideration. The change of policy announced a 

 year since, in accordance with which the strength of the Institu- 

 tion was devoted more to the supporting of larger scientific 



