diff --git a/src/model.rs b/src/model.rs
index cb7d80e..b0a3f3b 100644
--- a/src/model.rs
+++ b/src/model.rs
@@ -158,7 +158,7 @@ impl Model {
         diffusivity: usize,
     ) -> Self {
         let particles_per_grid = (n_particles as f64 / n_populations as f64).ceil() as usize;
-        let n_particles = particles_per_grid * n_populations;
+        let _n_particles = particles_per_grid * n_populations;
 
         let mut rng = rand::thread_rng();
 
@@ -180,7 +180,7 @@ impl Model {
         }
 
         let mut grids: Vec<Grid> = Vec::new();
-        for _ in (0..n_populations) {
+        for _ in 0..n_populations {
             let agents = (0..particles_per_grid)
             .map(|i| Agent::new(width, height, i / particles_per_grid, &mut rng, i)).collect();
             grids.push(Grid::new(width, height, &mut rng, agents));