4ft iyescnplib7i of a circular 



had a dreadful stammer when eager in utterance, and rathef 

 harshly featured ; yet sense beamed from his eye, and his 

 eye-brow was expressive, and he had restored her three chil- 

 dren, who were amply provided for. He likewise came a- 

 courting, and recounted those verses he had formerly made! 

 on her charms. She was not long inflexible, although she 

 had ample choice amongst gentlemen fox-hunters, dashing 

 youno officers, bowing parsons, and along train of other gentry 

 — for the kind, the benevolent, the heaven-poetic-inspired 

 Dr. Darwin had the preference; but whether fearful that an 

 unjust suspicion would exist amongst the prudes and gossips 

 of Lichfield from this preference, that they might not have 

 niirid enouffh to comprehend the true reason of her choice 

 in consenting to give hiin her hand, she stipulated he woulil 

 immediately remove to Derby. 



[To be continued.] 



IX. Description of a drcidar Mothcr-of- Pearl Micrometef. 

 By David Brewster, A. iV/« 



To Mr. Tilloch, 



I SIR, 

 N the Philosophical Transactions for 179I, Mr. Tiberitis 

 Cavallo has given an account of an ingenious and simple mi-* 

 crometer, invented by himself, and excellently fitted for mea- 

 surino- small angles with accuracy and expedition. It con-- 

 sists of a 5vlip of mother-of-pearl minutely subdivided, and 

 Wretched across the diaphragm that is placed in the anterior 

 focus of the fourth eye-glass of an achromatic telescope. 

 The angle subtended by any number of its divisions is then 

 ascertained by experiment, and therefore the value of any 

 other number can either be found by simple proportion, or 

 from a table computed for the purpose. The method of 

 forming this table, and the various purposes to which this 

 micrometer is applicable, have been given at great length 

 bv Mr. Cavallo in his paper in the Philosophical Transac- 

 tions, and in a separate pamphlet descriptive of the instrii- 

 nicnt. 



la 



