July, 1842.] 187 



Browne, Esq. containing a description of a monstrosity occur- 

 ring in a species of Rose, in which a portion of the inflores- 

 cence had been superseded by a growth resembling a brand) 

 with its leaves ; with some explanations as to the mode in 

 which this anomalous condition was produced. 



The communication was referred to Drs. Pickering, Bridg- 

 es and Zantzinger. 



Dr. Chaloner read a translation from the French of M- 

 Linant's account of the discovery of the Petrified Forest near 

 Cairo, Egypt, with a description of the same. 



Specimens from this forest were presented by Geo. R. 

 Gliddon, Esq. at a former meeting of the Academy. 



On motion, Resolved, that a copy of this translation be 

 placed in the Library of the Academy. 



Mr. Haldeman read a paper, entitled " A Description of two 

 new species of Hydrachnae ; viz. H. nebulosa, and H. cocci- 

 nea ; and of one Daphnia, D. reticulata," which was referred 

 to a committee, consisting of Drs. Goddard, McMurtrie and 

 Pickering. 



VERBAL COMMUNICATIONS. 



Professor Johnson made some remarks on the determination 

 of copper in analysis. He stated that the usual mode was to pre- 

 cipitate the protoxide from solution; that in this case, it is neces- 

 ary that an excess of alkali should be added, and the precipitate 

 well washed. It is also attended by a loss in filtering, &c. 

 By using dry sulphate of copper these objections are obviated. 

 This salt is readily dried without decomposition; and Professor 

 Johnson stated that with the same portion of copper he re- 

 peated an experiment several times, and had found this mode 

 of determination more satisfactory than that by the oxide, and 

 with less variation in result. 



Mr. Haldeman then made the following remarks. 



From the great number of generic names required in Zoolo- 



27 



