The attention of our Subscribers is called to the Notice on the inside 

 page, relative to the enlargement of this Journal. 



No. XX— Vol. II. MAECH, 1862. Pnce 6d 



THE 



TECHNOLOGIST. 



A MONTHLY RECORD OF 



gtimte applteD to art aitf MmufMuve. 



EDITKD BY 



P. L. SIMMONDS, F.S.S., 



Author of a The Commercial Products of the Vegetable Kingdom? "A 

 Dictionary of Trade Products? " The Curiosities of Food? &c. 



CONTENTS. 



PAGE 



The Ivory Trade of Zanzibar. By Captain E. F. Burton.... 225 

 On the Amount of Tannine in some Astringent Substances, 

 and the Comparative Rapidity with which the Tannine 

 in several of these Substances undergoes Decomposition. 



By Wm. J. Wonfor and S. R, Pontifex 228 



Quantity of Oil furnished by the Seeds of various Forest- 

 Trees. By M. R. "Wagner 237 



The Fruit Trees of Brazil. By Dr. Heusser and G. Claraz 238 



Manufacture of Ink 241 



On the Cultivation of Cotton in British Guiana. By Sir "W. 



H. Holmes 242 



The Wild Cochineal Insect of India 247 



The Commercial Quassia, or Bitterwood. By Dr. Bowerbank 250 



Manufacture of Alkali 254 



Scientific Notes 255 



New Technological "Works * 256 



LONDON : 

 KENT & CO., PATEENOSTEE EOW. 



