520 THE VITAMINE CONTENT OF MAIZE. 



their vitamine indices may vary from the border-Hne lOO down 

 to 30. Since, however, these products are more expensive, and 

 only used by white people living on a mixed diet, their low 

 vitamine content is of minor importance. All samples of mealie 

 meal as ordinarily milled for native consumption were found 

 to be perfectly efficient, with vitamine indices ranging roiuid 130 

 to 140. The mode of cooking maize meal for native consump- 

 tion is also discussed, and the bearing of the various data 

 offered in the paper is considered in relation to the possible 

 incidence of deficiency disease on the Rand. 



(Read July 4, 1917.) 



THE SUPPLING KILN AS A MEANS OF DESTROYING 

 INSECTS BORING IN WOOD. 



Bv Charles William Mallv, ALSc, F.L.S.. F.E.S. 



{Not printed.) 



OPPORTUNITIES FOR THE SELECTION AND 



BREEDING OF DESIRABLE STRAINS OF 



BENEFICIAL INSECTS. 



By Charles William Mallv. M.Sc. F.L.S.. F.E.S. 



(Not printed.) 



NOTES ON ANHYDROUS LIQUID HYDROCYANIC 

 ACID AS A FUMIGANT. 



By Charles William Mally^ M.Sc, F.L.S., F.E.S. 



South African Shells.— In the course of a report 

 on the availability of shells in South x\frica for use in the manu- 

 facture of buttons, Prof. J. D. F. Gilchrist remarks that no South 

 African shells are gathered for commercial purposes except 

 those which are burned for lime, and those of the Argonaiif(e, 

 which have a small sale as ornaments. The only marine shells 

 which are likely to possess commercial value are the " klipkous " 

 (Haliotis) ancl the Cape pearl oyster (Margaritifera). Dr. 

 Gilchrist sent specimens of these shells to London many years 

 ago in order to ascertain their commercial value, but the price 

 quoted would hardly defray the expense of collection. It might 

 be, however, that a more favourable report wotdd be given if a 

 consignment were sent to the United States. These shells, more 

 especially the first-named, could be gathered in quantity, and a 

 report from American shell experts would be of great value, and 

 might lead to important developments. 



