446 PHILOSOPHICAL TRANSACTIONS. [aNNO I678. 



cave head, at the cone B. Within this is fastened a bended tube A a, as in the 

 figure. On trial before the Royal Society it was found, that this trumpet 

 distinctly delivered certain words from the said house across the garden and the 

 river Thames, and that against the wind, which was then strong : and the words 

 were written down by a person sent over for that purpose. By which it ap- 

 peared, that a reflecting trumpet after this, or some other like manner, of 

 wood, tin, pewter, stone or earth, or which may be best, of bell metal, will 

 send the voice as far as the long one invented by Sir Sam. Moreland, or farther. 

 Besides, that it seems to take off from the great noise near at hand, which 

 happens in the use of the long trumpet; so that it may be used within doors, 

 with advantage, on several occasions. 



Some other trials were made to effect the above mentioned contraction, 

 which were found not to answer. Yet because they may serve, in part, to 

 shew the motion of sound, I have added two examples hereof. The first is 

 Sir Samuel Moreland's trumpet angularly arched in the middle, fig. 7 ; the 

 second, with three large angular arches reaching almost from one end to 

 the other, as in fig. 8 : by the former of which the delivery of sound, to any 

 distant or remote place, is much shortened; but by the latter almost wholly 

 obstructed. 



An Account of two Books. N° 141, p. 1030. 



I. A Discourse of the State of Health in the Island of Jamaica, with a Pro- 

 vision calculated for the same, from the Air, the Place, and the Water ; the 

 Customs and Manner of Living, &c. By Thomas Trapham, M. D. Coll. 

 Med. Lond. Soc. Hon. 



This treatise on the climate, diseases, and natural productions of Jamaica, is 

 superseded by the later and more ample accounts of Sloane and Browne. 



II. Catalogus Stellarum Australium ; sive Supplementum Catalogi Tychonici^ 

 exhibens Longitudines et Latitudines Stellarum fixarum, quae prope Polum 

 Antarcticum sitae, in Horizonte Uraniburgico Tychoni inconspicuae fuere, ac- 

 curato Calculo, ex Distantiis supputatas, et ad Annum 1677, completum cor- 

 rectas. Cum ipsis Observationibus in Insula S. Helenae (cujus Latitudo 15 gr. 

 55 m. Austr. et Longit. 7 gr. 00 m. ad Occasum a Londino) summa Cura et 

 Sextante satis magno de Coelo depromptis. Opus ab Astronomicis hactenus 

 desideratum. Accedit Appendicula de Rebus quibiisdam Astronomicis, notatu 

 non indignis. Authore Edmundo Halleio, e Coll. Reg. Oxon. 



The author having found that the astronomical tables in use, are defective in 

 calculating the motions of celestial bodies ; so that Saturn for instance moves 

 much slower, and Jupiter swifter, than appears by those tables. Hence he had 



