32 



This free hydrate is only found when very large quantities of lime are 

 in question, such as are not employed in practical work. 



The usual procedure advocated for preparing Bordeaux mixture is 

 very defective. It may be substituted by a rational, easy method 

 wliich produces mixtures with a much higher anticryptogamic power. 

 The principle of this method is as follows : — If V be the volume of 

 Bordeaux mixture required, dissolve the given quantity of sulphate 

 of copper, in a volume of water equal to |V ; dissolve, separately, the 

 quantity of lime required for the formation of the tetracupric sulphate 

 in an equal volume of water (| V) ; and slowly pour the copper sulphate 

 solution into the milk of lime, vigorously stirring the while. A table 

 is given showing the quantity of CaO in solution for various densities 

 from 1° to 30° Baume, so that the operator may be in a position to 

 determine the precise quantity of copper sulphate required in order 

 to obtain the maximum of tetracupric sulphate, SO^, 4 CuO, in the com- 

 pleted spray ; milk of lime of from 9° to 12° Baume is the best for 

 practical purposes. 



The whole paper is highly technical and the subject is dealt with 

 entirely from the chemical point of view. The results of this exten- 

 sive research are however of great practical interest, as affording 

 an intelligible explanation of the variable effects obtained by the use 

 of Bordeaux mixtures prepared in the ordinary way. 



BuRREL ^M.). Instructions to Importers of Trees, Plants and other 

 Nursery Stock into Canada. — Dom. Canada Dept. Agric. Entmn. 

 Branch, Ottawa, Circular no. 4, August 1914. [Received November.] 



A full explanation of regulations for persons importing nursery 

 stock into Canada is given. The destructive insects, pests and 

 diseases to which the regulations apply, mclnde Phthorimaea opercidellay 

 the potato tuber moth, besides those previously enumerated [see 

 this Review, Ser. A, i, p. 48.] The regulations made under the San 

 Jose Scale Act are repealed. 



Report of the Coconut Commission, 1914. East Africa Protectorate : 

 Nairobi, 140 pp. 



In this Report of the Commission appointed by the Governor to 

 consider the question of the improvement of the coconut industry 

 on the coast of British East Africa, it is stated that the increase of the 

 coconut beetle, Oryctes monoceros, Oliv., and consequently the 

 damage done can be effectively controlled by the following methods : — ■ 

 The destruction of all uncontrolled breeding places ; the construction 

 of traps ; rewards for beetles, pupae, larvae and eggs ; the intro- 

 duction of a fungus parasite of the larvae. [For details of these 

 methods applied to Oryctes rhinoceros, L., see this Review Ser. A, ii, 

 pp. 26-28]. Appendix iii gives the legislation in force in other parts 

 of the world to control the spread of the coconut beetle and the 

 tapping of the palms for palm wine and includes the B.E. Africa 

 Coconut Beetle Ordinance of 1909, which has never come into force. 



