142 The Ohio Naturalist. 



country adjacent to the laboratory were productive of man)- 

 interesting objects for stud>', and reports on some of these will 

 appear in later numbers of the Naturalist. Special excursions 

 to Castalia, Lakeside, Kelley's Island, Put-in-Bay and Green 

 Island were not only enjoyable, but furnished much of profit in 

 the way of collections. One of the most appreciated feature was a 

 visit to the U. S. Fish Commission Hatchery at Put-in-Bay, wdiich 

 furnished an opportunity to watch the plankton work done on 

 the Shear Water under the direction of Prof. H. B. Ward. 



A series of Frida}' afternoon lectures on biological problems, 

 with titles, " Adaptation in Animal Life," "Aquatic Life," "Air- 

 breathing Animals," "Some Phases of Evolution," "Some 

 Problems in Applied Zoology," " Mimicry and Protective Resem- 

 blance in Nature," were given by Prof. Osborn, and one on 

 " Natural vSelection," by Prof. Landacre. 



THE MAXIMUM HEIGHT OF PLANTS III. 



John H. Schakfner. 



During the past summer, the plants mentioned below were 

 measured by the writer in northern Kansas. A number of species 

 grew far beyond the height mentioned in our manuals, although 

 there was a very severe drought the entire summer. The height 

 given probably approaches the maximum in but few cases and a 

 better growing season might produce a ver}' noticable increase in 

 size. The measurements are given in comparison with those of 

 Britton and Brown's Flora. 



Britton. Measured. 



Polygonum lapathifolium h 3 ft. 8 ft. 



Polygonuni cainporinn Meisu 3 6 '4 



Froelichia floridiana ( Nutt. ) Moq 4 5 



Chenopodiuni album L. .. . 10 12}4 



Anemone virginiana L. (Ohio) 3 3^ 



Polanisia trachysperma T. & G i)4 2^ 



Cassia chamaecrista L 2 V^ 5% 



Astragalus carolinianus L, 4 5^ 



Meibomia illinoensis ( Gr. ) Ktz 4 7 



Euphorbia dentata Michx i ^ 4 



Euphorbia hexagona Nutt i- ^ 5 



Euphorbia nutans Lag 2 2,y^ 



Ceanothus ovatns Desf 4 



Anmiannia coccinea Rottb 1-3 3 



Gaura parvi flora Dougl 5 12 



Stenosiphon lini folium (Nutt. ) Britt 5 8 



Onosmodium molle IMichx 2 2 '/^ 



Lycopus americanus Muhl 2 5 



^lentha canadensis L 2j^ 3 



Mimulus ringens L 3 2iH 



Lacinaria punctata (Hook.) Ktz 2^ 3 



Helianthus giganteus L. (Ohio) 12 13 



Coreopsis trip' eris T^. ( Ohio ) 8 9 



Carduus altissimus Iv lu i r 



