349 



ing the attention of scientific men to a new class of 

 fossils, has the very best opportunity for a description of 

 them. 



Prof. Rogers expressed himself much pleased with the 

 exquisite delicacy of the drawings, which, together with 

 the resemblance in color to the original stone, makes 

 them very valuable. Dr. Deane was the fir^t to recognize 

 these impressions as of animal origin, and there could 

 be no question but that he was well fitted to undertake 

 a memoir upon the subject. He thought Dr. Deane 

 should receive a verbal encouragement, at least, from the 

 Society, and accordingly the Secretary was requested to 

 transmit to him an expression of the great interest which 

 the Society feels in the prosecution of his labors, and the 

 assurance that he may expect every encouragement which 

 the Society has in its power to extend. 



Dr. Hayes submitted the following remarks, on some 

 specimens of guano, which he exhibited, from the islands 

 of the Atlantic Ocean. 



About two years since, an enterprising commercial firm in this 

 city, discovered on Monks Island, — a small island off the coast of 

 Guyana, — a remarkable rock, covering a deposit of the kind of 

 guano now so well known, as coming from the Atlantic side of 

 South America. 



The rock and guano were sent to me for chemical analysis, 

 and finding both to possess a high economical value, I recom- 

 mended the introduction of them as sources of phosphate of 

 lime, for agricultural purposes. A large quantity of these pro- 

 ducts has been imported, and numerous analyses by myself and 

 others, have shown a considerable uniformity in the composition 

 of thousands of tons. 



The specimens now before you, exhibit averages of the two 

 varieties. 



In the specimen which I have called Guano Rock, we have 

 irregular incrustations of from one inch to two feet in thickness, 

 pale yellowish brown, or nearly white, while its fracture is of 



