120 PHILOSOPHICAL TRANSACTIONS. [aNNO I764, 



eclipse began at 9'' 40*" 41' in the morning; and ended at 43™ afternoon; the 

 greatest obscuration 10 dig. 25-^', was at ll'' lO*" 56'. The sun's diameter mea- 

 sured 32' 4".8. 



XXXI. Observations on the Eclipse of the Sun at Chatham, j4pril 1, 1764. By 

 Mr. Mungo Murray. Communicatedin a Letter from Dr J. Bevis. p. 171. 



I fancy I can now satisfy your curiosity as to a place in the northern limit of 

 the path of the moon's shadow in the eclipse; that is, where the lower limbs of 

 the sun and moon coincided, by the following abstract of a letter from Mr, 

 Mungo Murray of Chatham, a good mathematician, and author of an excellent 

 work on ship-building. 



" I am infinitely obliged to you for your kind present of the telescope glasses. 

 I got them most curiously mounted, and, as you said, they make a 12-foot 

 telescope, which takes in the whole sun nearly. I set my watch by a very good 

 vertical sun-dial, precisely at 9 o'clock, and at 8 minutes after I perceived the 

 moon just enter on the sun. About half an hour after 10, the eclipse was barely 

 annular, the light of the sun below the moon being but just visible, and less 

 than a hair in the telescope. At 55 minutes past 1 1 the eclipse ended, and left 

 the sun quite round." 



By this, sir, I think you may safely conclude, that Chatham was not much 

 more than a mile (perhaps less) south-east of the limit ; which therefore passed 

 over Rochester-bridge, or very near it. 



XXXII. Observations and Experiments on different Extracts of Hemlock. By 

 Michael Morris, M. D., F. R. S. p. 172. 



Dr. M. here states that Dr. Wade, an eminent physician at Lisbon, having 

 communicated to the London Medical Society, a number of cases, in which the 

 extract of hemlock, prepared at Coimbra in Portugal, had been given with ex- 

 traordinary success, and having sent him at the same time specimens of the sue 

 cessful extract, and also of the extracts of hemlock prepared at Lisbon, and by 

 Dr. Storck's apothecary at Vieima, which 2 last-mentioned extracts he had pre- 

 scribed for the space of 3 years, in various disorders, to little or no effect; he 

 thought an experimental inquiry into the component parts of these extracts and 

 that used in London might be attended with some useful or curious consequences: 

 more especially as this medicine was near losing its credit entirely, from its little 

 success here, in those disorders in which it had been most strongly recommended 

 by Dr. Storck. He thinks it not unnecessary to premise further, that the ex*- 

 tract prepared at Coimbra is not so moist as the other extracts, and that it has 

 been given for a considerable time at the dose of i scr. twice a day without pro- 

 ducing the least disagreeable symptom. 



