REVIEWS AND NOTICES OF HOOKS. 



235 



maximum of 250 lbs. per square inch. There is one 18 x 20 x 

 24-inch Laidlaw-Dunn-Gordon air compressor, and one 9 x 

 12 X ID-inch Worthington for auxihary purposes. Near the 

 ground tanks are two 8x8|x 12-inch Fairbanks Morse and 

 Co. pumps for raising oil to the storage tanks. 



The buildings are constructed of reinforced concrete. The main 

 building is 155 feet long and loi feet wide, and is divided into 

 two sections, one for the cylinders and the other for pumps, etc. 



An interesting feature is the experimental plant, which is so 

 fitted up that experiments may be carried on in a small way 

 under precisely the same conditions as the work on a large 

 scale in the body of the plant. The experimental cylinder is 

 48 inches in diameter and 12 feet long, and is adapted to with- 

 stand a working-pressure up to 400 lbs. Other equipment 

 consists of a pressure cylinder 5 feet in diameter by 8 feet long, 

 oil pressure pumps, vacuum pumps, condensers, etc. This plant 

 is located in a separate building. 



REVIEWS AND NOTICES OF BOOKS. 



Illustrations of Conifers. Vol. II. By H. Clinton Baker. 

 Printed privately by Simson, Hertford, 19 10. 72 pp.. 

 Quarto, with 89 full-page illustrations. 



Mr Clinton Baker's second volume is of as great, if not 

 greater, value than the first (see vol. xxii. p. 239), to all those 

 who themselves collect conifers or take pleasure in seeing and 

 identifying the collections of others. The volume contains the 

 important genera Abies, Picea, and Larix, as well as the 

 majority of the smaller groups, such as Sequoia, Araucaria, etc. 

 All the most recent botanical information is embodied in the 

 short descriptions of the species, and cone-bearing branches 

 have been chosen and photographs of them prepared with the 

 greatest possible care. 



It would be well that all nurserymen who sell young trees 

 should revise their lists after a close study of Mr Clinton Baker's 

 book. Some of the Western America silver firs are consistently 

 misdescribed by nearly all British nurserymen ; the writer's 

 experience being that Abies lasiocarpa is practically unobtainable 

 in this country, and that it is Abies Loiaiana which is usually 



