IIECEEATIVE SCIENCE. 



121 



between | in. and If in. apart. Tlie one near 

 the eye must be 1 ia. and tbe other l^ in. 

 focus, with their flat sides toward the eye, 

 and a stop of i in. between them. 



Section of Object-glass Box. External dark portion, 

 wood ; lines across centre, lenses ; corners, putty. 



All interiors to be blackened ; the large 

 tube can be smoked. If the small pieces of 

 the eye-piece are turned too small, the plan 

 used in a flute can be adopted. 



Each lens should cost I*. 6d., the tube 

 4s. Gd., and the wooden boxes for lenses 3*. 

 at the utmost. 



At such a price, of course, it is not 

 achromatic ; but if the tube is straight, and 

 the object-glass stopped down to about 2 in., 

 it will prove very effective on the Sun, Moon, 

 Jupiter, and Saturn. 



Section of Ej'epiece. — a a slide in 6 6 The black 

 line is a stop of card-board. At tlie extreme right 

 hand is the position of dark glass for viewing the 

 sun. 



A piece of a smashed negative collodion 

 plate is a very good substitiite for the black 

 glass used before the eye-piece of telescopes 

 when looking at the sun. 



Heebeet Hukst. 

 Upper Clapton. 



DO DOGS UNDERSTAND HUMAN 

 SPEECH P 



A GENTLEMAN met with a retriever while on 

 a shooting excursion. The dog came in obe- 

 dience to a whistle, and after a little coax- 

 ing made himself quite friendly. There and 

 then the dog adopted a master who could 

 appreciate his noble qualities, and so they 

 went home together. 



Some few weeks after this took place, a 

 stranger happened to be shooting in tho 

 neighbourhood, and passing near the house 

 where the dog had taken up his abode, he 

 was seen by the owner, who invited him in 

 to partake of refreshments. In the course of 

 conversation he was asked, " What sport ?" 

 *' None worth speaking of," he replied ; " my 

 dog is unequal to his work. I lost one a 

 short time since worth his weight in gold, 

 and, unfortunately, have heard no tidings of 

 him since." " But how and where did you 

 lose him ?" inquired the host. " Why, about 

 fifteen miles from here, while out shooting, I 

 missed several birds, which made me angry. 

 I beat the dog, and threatened to shoot him. 

 When I got into the next field * Grouse ' was 

 gone. I tliought I should find him at home ; 

 but no, he had gone utterly, and I believe he 

 went because I threatened to shoot him." At 

 this moment the dog entered the room. It 

 was the lost dog, and of that there could be 

 no doubt, but he disowned his former master. 

 To the stranger's call he was stubbornly deaf, 

 and when he attempted to pat him he re- 

 sponded with a growl that had no friendly 

 meaning in it. The dog then crouched under 

 the sofa, and refused to move until the 

 object of his hatred left the room. A cord 

 was then tied round his neck, but he planted 

 his foot firmly, and could not be moved. His 

 old master had no alternative but to abandon 

 ownership, and make him a present to his 

 host. 



There is a saying that the more you beat 

 a dog tlie more he'll love you ; but here we 



