3()2 NATURE-STUDY REVIEW [13:8— Xov., 1017 



The Submarines in Our Brook 

 This should be an account of the fish, crayfish, and insect larvae, whicli 

 live below the surface of the water. 



Experiment ix Sedimextat^ox 

 Take a glass fruit jar nearly full of water from the brook, add gravel and 

 small stones from the bed of the brook, sand from its borders and mud from 

 its quiet pools. Have it brought into the schoolroom, and shake it thoroughly. 

 Then place in a window and ask the pupils to observe the following things: 



(a) Does the mud begin to settle while the water is in motion; that is, 

 while it is being shaken? 



(b) As soon as it is quiet, does the settling process begin? 



(c) Which settles first — th€ pebbles, the sand or the mud? Which scttle^ 

 on top — that is, which settles last? 



(d) Notice that as long as the water is in the least roily, it means that the 

 soil in it has not all settled ; if the water is disturbed even a little it become?- 

 roilv again, which means that as soon as the water is in motion it takes U]) 

 its load. 



A Game to Plav While Studying the Brook 

 The following game used as a part of the R-hode Island Arbor Day progran; 

 is so full of excellent suggestions for pupils studying a brook that we publisli 

 them as a part of this \\ork. The first six questions can be changed to fit 

 I he locality imder observation. 



QUESTIOXS FOR FIELD OBSERVATIOXS 



Inter-class Meet, Lincoln Woods, Arbor Day, May ii, 1917 

 Designed for those not assigned to special games, who should organize ba- 

 dasses. The number of points made will depend to some extent upon tbe 

 organization. Each question answered correctly means the credit of one point 

 toward a final score. One delegate from each class should be prepared tc- 

 report the data agreed upon to the following committee: Dr. Carroll, Mr. 

 Brown, Mr. Vinal. 



1. Which is higher above sea-level, Olney Pond or the next pond in ar; 

 easterly direction? 



2. Where is North? (vShow by sun.) 



3. How far is it b}^ the shortest route from Twin Rock to the Butterfl\ 

 I'^actor}-? 



4. Point to Providence, Pawtucket and VVoonsocket. 



5. Is Olney l^ond at its highest level? What is basis for answer? 



6. Account for the difference in soil on the bottom of Olney Pond and o; 

 the bottom of the outlet? 



7. Name one floating plant that you may observe in Olney Pond. 



8. Obtain one wading plant. 



9. Obtain one submerged j)lant. 

 10. Catch a dragonfly nymph. 



1 I. Find tlie larva of tlie caddis-flv in its case. 



