fli a Two Fcttuses produced lij the same Parrots which 



board, and suddenly let l(wse to fly back by their own force 

 against a piece of wood hanging Uke a door on hinges*. 

 The piece of wood should move on a graduated arch, in 

 order to determine the degree of force with which the dif- 

 ferent slips fly back. 



Observations. — How far this contrivance will answer I 

 im not able to determine ; but it appears on consideration 

 that some judgiiierit may be formed of the elastic quality of 

 bodies by this method, where the substance is capable of 

 being cut into slips, which will bend easily and recover their 

 form again. Should eithei" of these pi'5posed schemes, or 

 others more preferable, be adopted, it appears to me that 

 the know ledge obtained by them might be of considerable 

 tise in various branches of art, as well as satisfactory to the 

 inquiring naturalist. 



Loni'on, 

 September 7, i?03. 



LIX. Account of two Foetuses produced hy the same Parrots 

 which ill the Year 1801 produced a yninig one at Rome. 

 Bji C. L. MoROzzo, Mcml/er of the institute of BnloguOy 

 of thk Italian Sonet 1/ of the Sciences, of the Academy of 

 Stockholm, and of that of Padua \. 



JLn the letter which I addressed to C. Lacepede in- the year 

 1801 on the birlii of a parrot at Rome (see Philosophical 

 Magazine, No. XLVIT.), I contracted an engagement with 

 the public, as I promised to employ all my care on the eggs 

 which these parrots mi^ht lay in the spring of the next year 

 (1802). I shall now discharge my promise; and though my 

 care was not crowned with success, I flatter myself that the 

 amateurs of natural history will fuid in it some interesting 

 details. 



I did every thing in mv power to get again into my 

 hands these parrots, promising to the owner to take the 

 greatest care of them possible. By these means I should 

 have been enabled to observe more exactly their habits ; but 

 J. A. Passcri, the owner of them, who was governor of 

 Or\"i<>to, eave absolute orders that his son, in whose kecp- 

 inc^ thcv had been the preceding year, and at whose house 

 I had made all my observations, should send them to him. 



* Or it mr-v be made to strike the end of a rod or arrow in the manner 

 of the catapulta. The distance to which the arrow is carried will detef. 

 mine the elastic force —'Eorr. 



f Yxi^m t\\e Journal de Pbjsiquc, Florcal, an. 11. 



These 



