New York ? Cowboy dreams aside, a new ranking of jobs might encourage some students to work a little harder on their biology homework.

While the job of biologist takes top overall honors in the latest edition of the “Jobs Rated Almanac,” employment as a cowboy ranked a lowly 248th out of the 250 jobs reviewed.

Cowboys are paid about $31,000 a year on average, have limited prospects for advancement and face some of the greatest physical demands, according to the listing, which ranks jobs in a variety of categories. Only the physically demanding and low-paying work of the fisherman and the lumberjack ranked lower.

Biologists, in comparison, make an average of more than $92,000 a year and have the best future prospects, sparked in large part by the completion of the human gene map and last year’s anthrax scare, according to the book’s editor, Les Krantz.

“This book is about the real, honest-to-God, no-fooling-around workaday week,” said Krantz, whose own job, publication editor, was ranked 31st overall.

Begun in 1988, the sixth edition of the list was released Friday. In previous editions, the top spots have gone to actuary and financial planner, Nos. 2 and 3 this time.

Krantz uses statistics from the U.S. Department of Labor, the census, professional organizations and telephone surveys in ranking 250 jobs. The jobs are ranked according to six variables: income, stress, physical demands, potential growth, job security and work environment.

The new edition’s top 10 overall jobs were rounded out by computer systems analyst, accountant, software engineer, meteorologist, paralegal assistant, statistician and astronomer.

Completing the bottom 10 were roofer, farmer, construction worker, taxi driver, seaman and ironworker.

Some of the highest paid jobs are coupled with high stress and a poor work environment. The office of president has the fifth highest pay at $400,000, but is ranked 175th because it has the worst work environment and the highest level of stress, Krantz said.

Professional athletes also have the potential for high pay and a lot of time off, but their job comes with substantial stress, limited security and heavy physical demands. Other high-stress, physically demanding jobs, such as police officer and firefighter, come with moderate pay and poor work environments.