Mat 13, 1904.] 



SCIENCE. 



757 



Jennings, H. S. 



' Studies on Reactions in Stimuli in Unicellular 

 Organisms.' American Journal of Physiol- 

 ogy, Vol. 8, No. 1, 1902. 

 Bawden, H. Heath. 



' The Psychological Theory of Organic Evolu- 

 tion.' The Journal of Comparative Neurol- 

 ogy, Vol. 11, No. 3, 1901. 

 Cope, E. T>. 



' Origin of the Fittest,' 1887. 

 'Primary Factors of Organic Evolution,' 1895. 

 LOEB, J. 



' Comparative Physiology of the Brain and Com- 

 parative Psychology,' 1900. 

 BiNET, Alfred. 



' The Psychic Life of Microorganisms.' 

 Baij)WIN, J. M. 



' Mental Development of the Child and the Race.' 

 Macmillan & Co., 1895. 

 Makshall, H. R. 



• Instinct and Reason.' New York, 1898. 

 Peckham, G. W., and E. G. 

 ' Instincts and Habits of the Solitary Wasps,' 

 1898. 

 Morgan, C. Lloyd. 



' Habit and Instinct,' 1896. 

 ' Animal Behavior,' 1900. 



SCIENTIFIC BOOKS. 

 British Museum {Natural History). Second 



Report on. Economic Zoology. By Fred. 



V. Theobald, M.A. 



The author, who is vice-principal and zool- 

 ogist of the Southeastern Agricultural Col- 

 lege, and lecturer on economic entomology to 

 Swanley Horticultural College, in England, 

 has carried on the whole of this work, and 

 drawn up the report as printed. It contains 

 a large part of the information furnished by 

 the director. Professor E. Ray Lankester, to 

 the board of agriculture and fisheries, between 

 November, 1902, and November, 1903, besides 

 the replies given by the zoological department 

 to other correspondents in connection with 

 economic zoology, as well as special notes and 

 some longer papers dealing with the subject. 

 This makes a volume of nearly 200 pages of 

 preeminently economic literature, relating to 

 subjects of the utmost importance to the 

 husbandman, not only in England, but 

 throughout the British colonies as well. It 

 is a very creditable report, from both the 

 practical and the scientific point of view, and 



exhibits on the part of both author and di- 

 rector a sincere desire to enlarge its viseful- 

 ness. This is witnessed by a number of cases 

 where Mr. Theobald has been able to make 

 some personal investigations and experiments, 

 the results of which are given and serve to 

 add materially to the economic value of the 

 volume. It will prove of interest to Amer- 

 ican entomologists in a number of ways, as 

 subjects of applied entomology in British 

 colonies overlap similar subjects of investiga- 

 tion in the United States. Thus the Mexican 

 cotton-boll weevil, cotton-boll worm, American 

 fowl tick (Argas americanus Packard), Medi- 

 terranean flour moth, pear midge, wooly aphis 

 (which our British cousins term the American 

 blight) pea weevil, hog louse, sheep scab, cab- 

 bage root-fly, larch and spruce aphis, willow 

 scale, ox warble fly, liver fluke in sheep, rose 

 aphis, grain weevil, and the sheep nasal fly 

 are all of them cosmopolitan pests, and any- 

 thing pertaining to them is of equally general 

 interest, and all receive attention in this re- 

 port, together with suggestions for the best 

 means of prevention or extermination. 



Mr. Theobald has been able to experiment 

 with arsenate of lead for codling moth, and 

 found that it is as effective in England as it 

 is in America; besides he has found that while 

 fruit growers can not combine Paris green, 

 Bordeaux mixture and paraffin emulsion, they 

 can do so with arsenate of lead substituted 

 for Paris green, and besides combine with 

 quassia washes, thus securing a wash that will 

 combine two chief insecticides and a fungicide. 



The introduction of beneficial lady beetles 

 comes in for its share of attention, and there 

 is much encouragement in reading of the in- 

 quiries that have been received from not only 

 hop growers but fruit growers. Surely, if 

 some of the aphis-eating lady beetles that the 

 writer observed in the gardens about Hobart, 

 Tasmania, a number of years ago, feeding on 

 these insects, could be colonized in the United 

 States, there might be considerable benefit 

 derived from them, and there is no reason to 

 suppose that the results would differ in Eng- 

 land. 



While not of vital importance to the Amer- 

 ican entomologist or fruit grower, it is inter- 



