Ixiy PfiOCEEDTNQS OP THB 



of the CycadesB, and its relation to the Stems of Coniferae and of 

 Tree-Ferns." His later works on anatomy had reference princi- 

 pally to the structure of Dicotyledonous trees and G-ymnosperms. 

 In 1834 he wrote upon the Structure and Form of Pollen G-rains, 

 but this work was hardly considered worthy of his reputation. 

 The construction and use of optical instruments was always one 

 of his favourite subjects ; and he contributed to the ' Linnsea ' (in 

 1842) some observations on the determination of the Size of 

 Microscopical Objects, and (at different times) to the 'Botanische 

 Zeitung ' some remarks upon the conservation of microscopical 

 preparations, and on the examination of cellular tissue by polar- 

 ized light. 



In the department of morphology Von Mohl wrote on the sym- 

 metry of plants, on the male flowers of the Coniferae, on the spo- 

 rangium and spores of Cryptogams, and on the structure of Scia- 

 dopitys. Other subjects, such as the authority for generic names, 

 the influence of soil upon the distribution of Alpine plants, and 

 Linnseus's views as to the theory of descent, also engaged his 

 attention; and vegetable pathologists are indebted to him for his 

 remarks upon the diseases of the vine and the mulberry. 



The above account, incomplete as it unavoidably is, will be suf- 

 ficient to show the extent and value of Von Mohl's scientific 

 labours. No small addition to these labours was involved in the 

 constant and active interest which he took in the ' Botanische 

 Zeitung.' The high scientific position which that periodical holds 

 is to a great extent due to Von Mohl's editorship and super- 

 intendence. 



Von Mohl was elected a Foreign Member on the 2nd of May, 

 1837. 



The Eev. Henbt Eookin, M.A., died on the 18th of January 

 1875, in his 73rd year. He was formerly Fellow of Queen's 

 College, Oxford, and for forty years was Incumbent of Upton 

 Grey in Hampshire. He was elected a Fellow on the 2nd of 

 December, 1834. 



Jesse Watts Eussell, D.C.L., F.E.S., died on the 26th of 

 March, 1875, at the age of 88. He was elected a Fellow on the 

 4th of November, 1823. 



George Ealph Tate, M.D., was born at Alnwick on the 27th 



