29 



Mr. Wesche, said, referring to the first paper, that he had noticed 

 in Africa that the males of the tsetse fly always exceed the 

 number of females. This might be due to the retiring habit of 

 the sex. The proportion observ^ed was about five males to one 

 female. 



Mr. J. P. Wright sent a short note relating to some as yet 

 unidentified beetles found in bales of Turkish tobacco. Turkish 

 tobacco leaf is imported in bales, fairly compressed. When an 

 infected bale is opened, few^ mature beetles are observed, but 

 when the leaves are separated they soon make their appearance. 

 In an infected bale the eggs, and subsequently the adult insects, 

 are plentiful ; but the larval and pupal stages are difficult to 

 discover. The author's informant told him that " the beetles 

 thrive merrily on naphthaline." As an experiment, some infected 

 leaf was put into a box with a perforated false bottom, in which 

 was put some naphthaline, and so left for some time. It was 

 found that the beetles had left the leaf and taken refuge in the 

 naphthaline, from which, however, they flew in clouds (!) as soon 

 as the cover was remov^ed. Carbon bisulphide effectually dis- 

 poses of them. These beetles are not found on Indian, African, 

 Virginian, or China leaf, but seem peculiar to the Turkish 

 growth, and it is only an occasional bale of this kind that is 

 so infested. 



Mr. A. C. Banfield read a paper on " Low-power Photo- 

 micrography and Stereo-photomicrography." He said that he 

 wished to draw attention to the singularly beautiful results 

 Avhich are obtained by applying stereoscopic methods to photo- 

 micrography, results which, in possessing the third dimension 

 of depth or distance, tell more of the actual shape of an object 

 in a single glance than is possible by any monocular photograph, 

 however good. Keference was then made to the nature of a 

 stereoscopic photograph, and to the reason that two apparently 

 similar photographs of a given object should give such an 

 appearance of relief when examined through a stereoscope. 

 But the two photographs are only apparently similar, for differ- 

 ences between the two pictures exist, in most cases so small as 

 to be imperceptible to the unaided eye, but nevertheless there 

 and it is to these minute differences, recognised by the brain, 

 that we owe the wonderful eff'ect of the stereoscope. The 

 dissimilarity of the two pictures corresponds to the different 



