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MICROSCOPICAL MEMORANDA. 



Organic Composition of Chalk and Chalk Marl. The following Table, 

 taken from Mr. Weaver's View of " Ehrenberg's Observations on the 

 Organic Composition of Chalk and Chalk Marl," in Taylor's Annals of 

 Nat. Hist, for June, 1841, p. 311, exhibits the number of Species of 

 Infusoria, Polythalamia, &c., met with in the specimens examined by 

 Ehrenberg : 



Death of Mr. David Don. It is with much regret we announce the 

 decease of this talented and much respected Botanist and observer, 

 which took place on the 7th of December, 1841, at ten minutes to 

 One, A.M., at the apartments of the Linnsean Society, Soho Square. 

 His remains are deposited in the Kensall Green Cemetry. 



