74 Geological Society : — 



methylbenzylenic ether, phenyl paratoluate, citronellic aldehyde, 

 &c. The actual methods of extracting the oil of rose by macera- 

 tion, enileiirage, and by the use of various solvents, are fully 

 discussed and illustrated by figures. The "citrine odours" are 

 described in the third chapter. These comprise the oils of orange, 

 lemou, lime, shaddock, and bergamot ; incidentally sylvostrine is 

 referred to, and the oils of neroli, citronella. and lemon-grass 

 (Andropogon citratus, DeCand.) receive adequate consideration. 

 Jasmine, jonquil, and hyacinth are treated of in the fourth chapter, 

 the odour of violet in the fifth, ylangylang &c. in the sixth, and 

 the " odour of the hayfields " in the seventh. In this last chapter 

 we find an account of coumarin, both natural and synthetical. 

 The eighth chapter, on vanilla, claims over 30 pages, and is 

 remarkably complete from every point of view. In the ninth 

 chapter the bitter almond, cherry laurel, and heliotrope are treated 

 of; in the tenth chapter, cinnamon, cassia, and clove; in the 

 eleventh, benzoin, storax, and the balsams; and in the twelfth, 

 opoponax, bdellum, myrrh, &c. Lign-aloes, patchouli, and related 

 perfumes are described in the thirteenth chapter; santal and 

 cedar in the fourteenth ; camphor in the fifteenth ; cajeput, 

 lavender, and rosemary in the sixteenth and concluding chapter. 



There can be no doubt, from this epitome, that Mr. Sawer has 

 succeeded in carrying out the idea set forth in the preface, wherein 

 he states: — "An endeavour has here been made to collect together 

 into one Manual the information which has hitherto been only 

 obtainable by reference to an immense number of works and 

 journals, English and foreign, in many cases inaccessible to readers 

 interested in the subject." 



It is not only as a technical work, however, that the present 

 volume demands notice in this Magazine. Although professedly 

 addressed to technologists, its subject-matter appeals both to 

 botanists and chemists ; and the latter will be surprised to find 

 what a large and interesting field of work is before them for inves- 

 tigating the constitution of the numerous odorous compounds 

 furnished by the vegetable kingdom or synthesized in the labora- 

 tory and factory. New outlets for tar-products may be looked for 

 in the direction of the perfume industry • and in bringing together 

 all that is known in connexion with the subject, Mr. Sawer has doue 

 good service to a somewhat neglected branch of applied science. 



X. Proceedings of Learned Societies. 

 GEOLOGICAL SOCIETY. 

 f Continued from vol. xxxiv. p. 385.] 

 November 9th, 1892.— W. H. Hudleston, Esq., M.A., F.R.S., 

 President, in the Chair. 

 rpHE following communications were read : — 

 J- 1. -* A Sketch of the Geologv of the Iron, Gold, and Copper 

 Districts of Michigan." By Prof. M. K. Wadsworth, Ph.D.', A.M., F.U.S. 

 After an enumeration of the divisions of the Azoic and Palaeozoic 



